期刊
MINERALS ENGINEERING
卷 70, 期 -, 页码 36-42出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2014.08.020
关键词
Gold; Glycine; Heap; In situ; Leaching
资金
- Curtin University
- AMIRA P420E program - Anglogold Ashanti
- AMIRA P420E program - Australian Gold Reagents
- AMIRA P420E program - Barrick Gold
- AMIRA P420E program - Gekko Systems
- AMIRA P420E program - Harmony Gold
- AMIRA P420E program - Kemix
- AMIRA P420E program - Magotteaux
- AMIRA P420E program - Newcrest Mining
- AMIRA P420E program - Newmont
- AMIRA P420E program - Orica
- AMIRA P420E program - Randgold Resources
- AMIRA P420E program - St Barbara
- AMIRA P420E program - Tenova-Bateman
The leaching of gold using alkaline amino acids-hydrogen peroxide solutions at low concentrations has been studied. The application of alkaline amino acid-hydrogen peroxide system may offer an alternative and environmentally benign process for gold leaching, particularly in the context of leaching low grade gold ores in an in-situ or in heap leach processes. In the presence of an oxidant or oxidants, it was found that amino acids can dissolve gold at alkaline condition at low and moderate temperature. Heating the leach solution between 40 and 60 degrees C was found to enhance the gold dissolution significantly in alkaline amino acid-peroxide solutions. It was also found that gold dissolution increases by increasing amino acid concentration, peroxide and pH. Amino acids acts synergistically to dissolve gold. Although glycine showed the highest gold dissolution as a single amino acid compared to histidine and alanine, histidine was found to enhance gold dissolution when used in equimolar amounts with glycine. The presence of Cu2+ ion enhances gold dissolution in the glycine-peroxide solutions. The process will propose an environmentally benign process for gold treatment in order to replace the use of cyanide in heap or in-situ leaching. In the presence of pyrite, the amount of gold leached was lower due to the peroxide consumption in sulphide oxidation. (C) 2014 Elsevier Ltd. All rights reserved.
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